Merge "Updated SkiaGLRenderEngine stretch logic" into sc-dev

    // which gets similar results for most surfaces

    // Determine later on if we need to leverage the stertch shader within

    // surface flinger

    if (stretchEffect.hasEffect() && /* DISABLES CODE */ (false)) {

    if (stretchEffect.hasEffect()) {

        const auto targetBuffer = layer->source.buffer.buffer;

        const auto graphicsBuffer = targetBuffer ? targetBuffer->getBuffer() : nullptr;

        if (graphicsBuffer && shader) {

        const auto graphicBuffer = targetBuffer ? targetBuffer->getBuffer() : nullptr;

        if (graphicBuffer && shader) {

            shader = mStretchShaderFactory.createSkShader(shader, stretchEffect);

        }

    }

    // Identifier used or various mappings of layers to various

    // textures or shaders

    using LayerId = uint64_t;

    using GraphicBufferId = uint64_t;

    // Number of external holders of ExternalTexture references, per GraphicBuffer ID.

    std::unordered_map<LayerId, int32_t> mGraphicBufferExternalRefs GUARDED_BY(mRenderingMutex);

    std::unordered_map<GraphicBufferId, int32_t> mGraphicBufferExternalRefs

            GUARDED_BY(mRenderingMutex);

    // Cache of GL textures that we'll store per GraphicBuffer ID, sliced by GPU context.

    std::unordered_map<LayerId, std::shared_ptr<AutoBackendTexture::LocalRef>> mTextureCache

    std::unordered_map<GraphicBufferId, std::shared_ptr<AutoBackendTexture::LocalRef>> mTextureCache

            GUARDED_BY(mRenderingMutex);

    std::unordered_map<LayerId, std::shared_ptr<AutoBackendTexture::LocalRef>>

    std::unordered_map<GraphicBufferId, std::shared_ptr<AutoBackendTexture::LocalRef>>

            mProtectedTextureCache GUARDED_BY(mRenderingMutex);

    std::unordered_map<LinearEffect, sk_sp<SkRuntimeEffect>, LinearEffectHasher> mRuntimeEffects;